P.S.A.'S · 5th May 2012
Terrace Daily News
Between April 29 and May 4 a region south of Haida Gwaii endured a series of tremors. Ranging between 3.8 and 4.7 on the Richter Scale the location of these quakes see them classifieds as being at Port Hardy. The fault lines the tremors affect are two which converge at the south tip of Haida Gwaii.
The trend of these events has been to get bigger, not smaller as is the norm for most earthquake events; a large shake followed by numerous small tremers.
The first of this series of four began on April 29 with a 3.8 shaker followed on May 1 (Tuesday) by 4.5; then May 2 (Wednesday) a 4.0 and finally yesterday May 4 (Friday) a 4.7 tremor.
As can be seen on the maps provided by USGS (US Geological Survey) the west Coast of Haida Gwaii is consider a high danger area coded as the highest threat available on the charts.
All picture/maps from the USGS.
Note the Global Seismic Hazard Assessment Program (GSHAP) colour shading on Haida Gwaii.
Apply the GSHAP graph to the map above and the Earthquake size and date data to the top picture